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860-7200-18 DTU DTB Service & Maintenance Manual
SENSORS
Front Sensing Edge Switch
The Destu-it machine may use a forward sensing edge switch to
stop forward travel if the machine impacts an object� The machine
will stop driving forward and the conveyor belts will shut o. The
fault can be cleared by driving the machine backwards for 1ft� The
switch is located along the forward edge of the operator platform�
The switch is a 2 wire Normally open switch� It sends a 24VDC
signal to the PLC if activated� There is terminal strip connector
inside the platform box which connects the switch to the PLC
circuits� The switch is fused in the Control Panel�
Area Scanner
There is an option on the Destu-it machine for an area scanner
on the front or rear of the machine or both�
The area scanners are comprised of a few parts� The main body
of the area scanner, which incorporates the actual optical scanner,
is located under the front of the operator platform and on the rear
of the machine base� The scanner head/display for each unit
is found inside an enclosure under the center oor plate in the
base of the machine� On the top of each display/head is the black
memory module� The memory module contains the software for
the scanner and connects to a power/logic output harness� The
scanner body and display are connected with a dedicated cable�
The scanner lens and ledge must be kept clean for the scanner to
function� The lens must only be cleaned with a clean, soft, damp
cloth or a pre-moistened lens cleaning cloth. The area scanner is
an optical device so the lens or ledge may not appear dirty, but
should be cleaned if it senses something that isn’t visibly apparent�
The area scanners control various operations of the Destu-it. The
scanners have two distinct zones� There is a warning zone and a
stop zone for each scanner. The front and rear zones are dierent
sizes and shapes� The zones are programmed by ELS and
must not be altered� The zones are calibrated to ignore machine
components always within their view such as the cage frame on
the front unit and the support frame for the third conveyor� If a
warning zone is activated, the machine will slow down and steer
away from it automatically� If a stop zone is activated, the machine
will stop driving and the conveyor belts will shut o and/or stop
the platform from lowering� A scanner LED box is installed on
the Control panel� The LEDS on the box indicate which area the
scanner is detecting an object and whether it is in the warning
zone (LED ashes) or stop zone (LED is on solid). The scanner
display box will also activate a Zero Point Turn or Bypass LED
which recommends the action needed to move the machine away
from the object�
The scanner body should never be adjusted or moved without
authorization rst. The scanner bodies are precisely positioned
and should never need adjustment�
Area Scanner Bypass
The scanners can be temporarily bypassed by the operator if
the machine is in a position where it cannot move or the platform
won’t go down� Using the switches on either side of the front
conveyor, the operator can temporarily bypass the scanners to
move the machine� The operator can only move in one direction
(zero turn, forward or reverse) until the scanners re-activate.
Once the operator stops the machine travel, the area scanners
work again� If required, they can be bypassed again to perform
another movement of the machine, until the machine is clear of the
obstruction� This procedure can be done in either AC or DC mode�
Check out this
quick video
showing you how
to bypass the
Area Scanners!
Front Sensing Edge Switch
Front Area Scanner
Scanner LED Box (Control Panel)
Rear Area Scanner
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